Armstrong Siddeley was formed when the Armstrong Whitworth aircraft company took over the luxury car manufacturer Siddeley-Deasey. It continued as a luxury car manufacturer until 1960 but, soon after the takover, it also manufactured aero engines. In the post war years it manufactured jet, turbo-prop and rocket engines. It was merged Bristol engines in 1960, becoming known as Bristol Siddeley and, in 1966, a further merger with Rolls Royce saw the end of the Siddeley name and the works became simply Rolls Royce. However, the Siddeley name survived in the name of the Hawker Siddeley Group.
Armstrong Siddeley was in Parkside, close to the centre of the city. This is reflected in the fact that three of the services were designated as cross-city routes calling at Parkside: Stoke Heath to Hearsall Common, Glendower Avenue to Copsewood and Kersley Road to Green Lane. However, in reality, the only fares available in the fare table were to or from Parkside so each leg has been treated here as a separate service. By 1962, only the Glendower Avenue and Coundon routes remained in operaton.